KR100614374B1 - Plasma display device - Google Patents

Abstract

When the signal line connecting each electrode of the plasma display panel and the driving circuit behind the chassis passes through the contactable vicinity of the chassis peripheral end, at least the edge of the direction in which the signal line is located at the peripheral edge of the chassis is deburring. A plasma display device is disclosed. Accordingly, the problem of product defects or deterioration in quality caused by damaging signal lines due to contact with sharp edges of the periphery of the chassis can be improved.

Description

Plasma display device {Plasma display device}

1 and 2 are parts of a cross-sectional view showing a part of a cross-section vertically cut a panel forming a screen in a state in which a chassis and a panel are combined in conventional plasma display devices;

3 is an exploded perspective view of an embodiment of a plasma display device according to the present invention;

4 to 6 are cross-sectional views illustrating a part of a cross section of a vertically cut panel forming a screen in a state where a chassis and a panel are combined in plasma display devices according to an exemplary embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10: panel display panel (PDP) 11, 13 substrate

20,23,25: heat transfer medium 30,30 ', 130: chassis base

33,35,133: peripheral end 40: protective plate

50: Tape Carrier Package (TCP) 51: Chip

21: double-sided tape 100: plasma display

113: circuit board 37,137,237: reinforcing material

139,239: (reinforcement) end

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a heat conductive medium of a plasma display device.

Plasma display panels are formed by forming electrodes on two opposing substrates, overlapping them at regular intervals, injecting a discharge gas therein, and sealing the plasma display panel (PDP). Refers to a flat panel display device.

Plasma displays can be formed thinner than Cathode ray tube (CRT) displays, which occupy a large volume, and thus are suitable for realizing a large screen with a relatively small volume. In addition, the plasma display device does not need to form an active element such as a transistor as compared to other flat panel display devices such as LCDs, and has a general characteristic of wide viewing angle and high luminance.

The plasma display device is formed by forming a plasma display panel and installing elements necessary for screen realization such as a driving circuit connected to each electrode of the panel.

In a plasma display panel, each pixel is represented through discharge in that pixel region. The discharge is generated in the pixel space by the voltage applied to the electrode, and generates atoms in the plasma or excited state in the space. The power required to discharge is eventually lost to light, but most of it is converted to heat in the panel. Materials such as phosphors that form the panel become a problem because they tend to deteriorate and denature when the temperature is high, and the life is shortened. In addition, overheating in the panel, in particular partial overheating, may cause thermal expansion deformation and subsequent stress of the glass plate, which is the substrate of the panel, and may cause breakage.

On the other hand, the driving circuit connected to the electrodes of the plasma display panel consumes a lot of power to implement the screen. The consumption of power eventually means heat generation, and when the driving circuit is overheated, it is likely to malfunction in the circuit operation. This malfunction may cause a problem that the quality of the screen is degraded, for example, to cause the discharge to occur even in the pixel portion that should not be discharged. Therefore, an important technical problem is how to effectively dissipate heat generated in a chip portion of a tape carrier package (TCP) and other driving circuits in which heat is concentrated in the plasma display device.

1 and 2 are cross-sectional views illustrating a part of a cross-sectional view of a panel vertically cut out of a panel in a state where a chassis and a panel are combined in a conventional plasma display device. More specifically, Figs. 1 and 2 show the lower part of the section in which the panel is cut vertically.

In order to dissipate the heat of the panel 10 and the driving circuit to the outside, a chassis attached to the back of the panel is usually used. The chassis is typically made by coupling the reinforcement 37 to the plate-shaped chassis base 30. The chassis base 30 may be integrally formed with a reinforcement part for reinforcement. On the rear of the chassis, circuits for driving the PDP are distributed on a plurality of substrates and mounted together with a power supply.

Accordingly, the chassis base 30 supports the panel 10 to reinforce mechanical strength and to release heat of the panel 10 or the driving circuit into the space. To this end, the chassis base 30 is formed of a metal such as aluminum having excellent thermal conductivity.

However, a plurality of lead electrodes are formed around the plasma display panel attached to the front of the chassis. The lead-out electrode is formed outside the sealing line, which is the periphery of the panel, to connect a plurality of electrodes such as an address electrode and a sustain electrode formed over the surfaces of the two substrates 11 and 13 constituting the panel with an external driving circuit. On the other hand, a driving circuit connected to the electrodes formed on the panel and driving them is usually mounted on the back of the chassis while being installed on a circuit board (not shown).

Therefore, in order to transfer the electrical signal of the driving circuit to each of the drawing electrodes, a signal transmission means for connecting the drawing electrode and the driving circuit is required. Such signal transmission means include Tape Carrier Package (TCP) or Chip On Film (COF). They are a kind of package having a signal processing chip 51 on its own and mediate one end of the terminal on both sides to which its terminal line is connected. Here, it is conceivable to simplify TCP as a signal line consisting of a bundle of conductors, with a focus on a flexible and long terminal line formed by forming a group of conductors on both sides of the chip 51 in the TCP 50 and the like.

This signal line connects the lead-out electrode provided in the panel 10 in front of the chassis and the drive circuit provided in the rear of the chassis, and thus passes through the peripheral ends 33 and 35 of the chassis.

However, the chassis of the large-screen plasma display is usually formed by press working, and the chassis peripheral ends 33 and 35 often have sharp cutting edges. In the process of assembling and completing the plasma display device, as shown in FIGS. 1 and 2, the signal lines may be easily touched and rubbed in contact with the chassis peripheral ends 33 and 35. Sharp frictional edges due to such friction cause signal lines to break or expose some of the conductors in the signal lines.

The present invention is to alleviate the problem that the signal lines connecting the electrodes of the panel and the driving circuit in the above-described plasma display device is damaged by touching the peripheral end of the chassis.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display device in which a periphery of a chassis is processed such that signal lines connecting the electrodes of the panel and the driving circuit reach the periphery of the chassis so that damage is not easy.

In order to achieve the above object, the present invention provides a plasma display device in which a signal line connecting each electrode of the plasma display panel and a driving circuit behind the chassis passes through a contactable vicinity of the chassis peripheral end, wherein at least the signal line at the peripheral edge of the chassis is positioned. It characterized in that the edge of the direction to be blunt (Deburring).

In the present invention, the formation of the dullness is wide, with the case of using a manufacturing method for forming a peripheral end without a blade from the beginning, and once the peripheral end with the edge is formed, the edge is blunted by grinding (grinding), The concept includes a case of blunting by forming an obtuse angle by chamfering by cutting or the like.

Thus, the chassis may be formed such that the end of the chassis has blunt edges from the beginning by methods such as casting, die casting, etc., rather than cutting or pressing. This die casting or casting process may be more useful when forming a chassis reinforcement that projects outside the chassis end rather than being applied to a large chassis-shaped chassis base itself.

On the other hand, the chassis may be considered a concept including the chassis reinforcement when the chassis reinforcement is combined. Therefore, when the chassis reinforcement protrudes outward from the peripheral end of the chassis and contacts the signal line instead of the peripheral end of the chassis, the signal line side edge of the peripheral end of the chassis reinforcement may be blunt.

In addition, when the peripheral end of the chassis is made up of a plurality of parts including the chassis reinforcement, the edge contacting the signal line of each peripheral end may be dull.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 is an exploded perspective view of an embodiment of a plasma display device according to the present invention.

Referring to FIG. 3, the plasma display device 100 according to the present embodiment is mounted on a plasma display panel including two substrates 11 and 13, a chassis base 30 supporting the panel at the rear of the panel, and a rear surface of the chassis base. And a circuit board 113 on which a driving circuit is installed.

On the front substrate 11, sustain electrodes having a straight line shape horizontally parallel to each other are formed, and on the rear substrate 13, address electrodes having a straight line shape perpendicular to each other are formed. The partition wall is positioned in parallel with the address electrode, and a phosphor layer is disposed above the address electrode.

A chassis is installed behind the rear substrate 13. The chassis is provided with a plate-shaped chassis base 30 and a reinforcing material 137 to prevent bending or deformation of the chassis. The chassis base 30 is fixed to the rear surface of the rear substrate 13 by a double-sided tape 21 or the like. The thermal conductive medium 20 is interposed between the chassis base and the rear substrate together with the double-sided tape 21.

A plurality of circuit boards 113, a power supply, and the like are installed behind the chassis base. The circuit board 113 includes driving chips and other electric and electronic element devices required for driving the panel. The circuit board and the circuit board are connected with signal lines as necessary.

A plurality of lead electrodes are formed around the plasma display panel attached to the front of the chassis. The lead electrode is formed outside the sealing part along the periphery of the panel so as to connect a plurality of electrodes such as an address electrode and a sustain electrode formed over the surfaces of the two substrates 11 and 13 constituting the panel with the driving circuit. On the other hand, the driving circuit connected to the electrodes formed on the panel to drive them is mounted on the rear of the chassis while being installed in the circuit board 113 or the like. In order to transfer an electrical signal of the driving circuit to each of the drawing electrodes, the drawing electrode and the driving circuit are connected by a tape carrier package (TCP) 50 or other signal lines.

Signal lines such as TCP are designed to have flexibility, and both ends are connected to the circuit board and the panel coupled to the chassis, with the middle part extending out with a marginal portion outside the panel and the periphery of the chassis body. Therefore, these protruding parts may be in contact with or caught by external objects during the process of joining the panel and the chassis or during the movement of the assembly. In order to prevent such damage, the end of the panel is provided with protective plates 40 to protect the signal lines from the outside. The protective plates 40 are coupled to the end of the chassis base 30 or to the reinforcement 137 around the end via screwing fixing means.

On the other hand, the upper and lower portions of the chassis base 30 are bent backwards at right angles and then bent to the opposite side, that is, outward by 90 degrees. The upper and lower parts of the chassis base 30 bent in this manner are bent with the chassis reinforcing material 137 that is bent in this manner to reinforce the upper and lower parts of the chassis base 30. However, the end portion 139 of the reinforcing material 137 extends outwardly more than the upper and lower ends of the chassis base 30. The outer end 139 of the extended chassis reinforcement is formed with a curved surface that is blunt or has no edges, whereas the peripheral end of the press-cut chassis base 30 has sharp edges. The end shape of this chassis stiffener can be made through deburring.

The TCP 50 terminal line that connects the protective circuit and the panel electrode by circumferentially surrounding the chassis peripheral end contacts the outer end of the extended chassis stiffener 137 and thus does not touch the sharp end of the chassis base. Therefore, the sharp edge of the chassis base end may damage the TCP 50 terminal line, thereby preventing the signal transmitted to some pixels forming the screen in the completed plasma display from being cut off or mixed.

The signal processing chip 51 of the TCP 50 emits a lot of heat in accordance with its operation. Therefore, the portion of the chip 51 of the TCP is formed to be in thermal contact with the reinforcement 137 of the chassis, the bent end of the chassis base 30, the protective plate 40, or the like to easily dissipate heat. In order to help the heat dissipation of the chip 51 portion, a plate-like heat conduction medium, a gel-like or liquid heat conduction medium such as a thermal grease, or the like may be interposed alone or in combination at the place where the chip part, the chassis, and the protection plate touch each other. .

Although the plasma display device can be a stand type, it is suitable for wall mounting, so that a wall-mounted boss can be mounted in the chassis so that the load is not concentrated when hanging on the wall.

4 to 6 are portions of a cross-sectional view showing a part of a vertically cut section of a panel forming a screen in a state where the chassis and the panel are combined in the plasma display devices according to the embodiment of the present invention. The lower part of the vertical cross section is shown.

Referring to FIG. 4, the basic panel 10 and the chassis have a coupling structure similar to that of the example of FIG. 1. However, the chassis peripheral end 31 in the portion A which has been a problem in the conventional example as in FIG. 1 is deburring. Therefore, there is no sharp edge at the portion of the chassis peripheral end 133 that contacts the TCP 50 terminal line, so that the terminal line of the TCP 50 is disconnected even when the terminal line of the TCP 50 directly contacts the chassis peripheral end 133. Alternatively, the film covering the conductors in the terminal line may be damaged to prevent the wires from being disconnected or mixed.

In the present embodiment, the dull formation may be performed by grinding the edges to make it blunt, or by cutting the edges by chamfering to form an obtuse angle. In addition, blunt formation includes, in a broad sense, a forming technique that forms an edgeless end from the beginning in an extrusion or casting method, particularly in a precision casting method such as die casting.

FIG. 5 is a cross-sectional view illustrating a lower portion of a cross section of the panel vertically cut in the state in which the panel, the chassis, and the protective plate 40 are assembled in the same embodiment as in FIG. 3.

As shown in FIG. 3, the upper and lower portions of the chassis base 30 are each bent once in the rear and the outer side. The upper and lower portions of the chassis base 30 formed as described above are reinforced with the chassis reinforcing member 137 bent in the same manner. An end 139 of the reinforcement 137 extends outwardly more than the upper and lower ends of the chassis base 30, and the outer end 139 of the extended chassis reinforcement 137 is formed to have a curved surface without an edge.

In this embodiment in which the chassis reinforcement with the outer end blunted forms the outermost part of the entire chassis to prevent damage to the TCP terminal line, it is easier to use a method such as extrusion or die casting to form the blunt. That is, the end of the chassis base is difficult to form dull by extrusion or die casting because the chassis base itself is large, but the chassis reinforcement is relatively small and easy to be pulled out by wire, and thus the end may be curved from the beginning through extrusion or die casting. .

On the other hand, even if the terminal line is bent or bent due to the mechanical rigidity of the film itself and the mechanical support of the conductors do not bend or bend at an angle such as a cloth. Therefore, the end portion of the reinforcement in the configuration using the reinforcement such as the present invention can effectively protect the TCP terminal line even if protruding only about 1 cm more than the sharp chassis base end, for example, considering the thickness of the chassis base.

Referring to FIG. 6, the lower end of the chassis base 30 is bent backward with respect to the panel 10 at a right angle once. The chassis reinforcement 237 is installed at the periphery of the chassis base 30 to surround the sharp end of the bent portion of the chassis base. The chassis reinforcement 237 may be fixed to the chassis base 30 with a screw or the like. Also in this embodiment, the outer end 239 of the chassis reinforcement 237 surrounding the end of the chassis base 30 is formed as a curved surface without an edge. The chassis stiffener 237 may be formed using extrusion to make the cornerless curved surface. The die of the extrusion process is used with the shape of the corner portion curved so that the end portion 239 of the chassis reinforcement 237 does not have sharp edges.

According to the present invention, even when signal lines such as TCP, which connect the electrodes of the panel and the driving circuit, touch the peripheral end of the chassis base or the end of the chassis reinforcement in the plasma display device, these ends have blunt edges or curved surfaces, thereby forming the entire signal line. These can be prevented from being cut or cross-talked with a large number of exposed parts.

As a result, the present invention can reduce the signal line damage caused by the edges around the sharp chassis of the plasma display device, so that the screen of the plasma display device can be realized without failure while achieving the overall state of the screen.

Claims (7)

The chassis is attached to the rear of the plasma display panel, The driving circuit for the panel is installed behind the chassis, In the plasma display device wherein the driving circuit and the electrode terminal provided in the periphery of the panel is connected by a signal line passing through the contactable vicinity of the peripheral end of the chassis, And a periphery of the chassis is deburring. The method of claim 1, Wherein the chassis peripheral end is a chassis base peripheral end of the chassis or a peripheral end of the chassis reinforcement. The method of claim 2, A peripheral end of the chassis reinforcement protrudes outwardly than the peripheral end of the chassis base and is closer to the signal line, And only a peripheral end of the chassis reinforcement is blunted. The method of claim 2, And a peripheral end of the chassis base and a peripheral end of the chassis reinforcement are respectively blunt. The method of claim 1, The dull formation is one of extrusion, casting, and die-casting processes for forming the periphery of the chassis in a curved surface. The method of claim 5, wherein And the peripheral end of the chassis is a peripheral end of the chassis reinforcing material. The method of claim 1, The dull formation is one of a method of forming an obtuse angle by grinding edges or removing edges by chamfering.

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